21000350 has 48 divisors (see below), whose sum is σ = 46202400. Its totient is φ = 6948480.

The previous prime is 21000337. The next prime is 21000367. The reversal of 21000350 is 5300012.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9116 + ... + 11184.

It is an arithmetic number, because the mean of its divisors is an integer number (962550).

Almost surely, 2^21000350 is an apocalyptic number.

21000350 is an abundant number, since it is smaller than the sum of its proper divisors (25202050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000350 is a wasteful number, since it uses less digits than its factorization.

21000350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117 (or 2112 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 21000350 is about 4582.6138829275. The cubic root of 21000350 is about 275.8939503653.

Adding to 21000350 its reverse (5300012), we get a palindrome (26300362).

The spelling of 21000350 in words is "twenty-one million, three hundred fifty", and thus it is an aban number.